Impact of Multiple Injection Strategies on Efficiency and Combustion Characteristics in an Optical PPC Engine

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

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Impact of Multiple Injection Strategies on Efficiency and Combustion Characteristics in an Optical PPC Engine. / Zhang, Miao; Xu, Leilei; Derafshzan, Saeed; Bai, Xue Song; Richter, Mattias; Lundgren, Marcus.

WCX SAE World Congress Experience. Society of Automotive Engineers, 2020. 2020-01-1131 (SAE Technical Papers).

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Harvard

Zhang, M, Xu, L, Derafshzan, S, Bai, XS, Richter, M & Lundgren, M 2020, Impact of Multiple Injection Strategies on Efficiency and Combustion Characteristics in an Optical PPC Engine. in WCX SAE World Congress Experience., 2020-01-1131, SAE Technical Papers, Society of Automotive Engineers, SAE 2020 World Congress Experience, WCX 2020, Detroit, United States, 2020/04/21. https://doi.org/10.4271/2020-01-1131

APA

CBE

MLA

Zhang, Miao et al. "Impact of Multiple Injection Strategies on Efficiency and Combustion Characteristics in an Optical PPC Engine". WCX SAE World Congress Experience. SAE Technical Papers. Society of Automotive Engineers. 2020. https://doi.org/10.4271/2020-01-1131

Vancouver

Author

RIS

TY - GEN

T1 - Impact of Multiple Injection Strategies on Efficiency and Combustion Characteristics in an Optical PPC Engine

AU - Zhang, Miao

AU - Xu, Leilei

AU - Derafshzan, Saeed

AU - Bai, Xue Song

AU - Richter, Mattias

AU - Lundgren, Marcus

PY - 2020/4/14

Y1 - 2020/4/14

N2 - Partially premixed combustion (PPC) is a promising way to achieve high thermal efficiency and low emissions, especially by using multiple injection strategies. The mechanisms behind PPC efficiency are still to be explained and explored. In this paper, multiple injections have been used to affect the gross indicated efficiency in an optical PPC engine modified from a Volvo MD13 heavy-duty diesel engine. The aim is both to improve and impair the gross indicated efficiency to understand the differences. The combustion natural luminosity is captured by a high-speed camera, and the distribution of fuel, oxygen, and temperature during the combustion process has been further explored by CFD simulation. The results show that with the right combination of the pilot, main, and post injection the gross indicated efficiency can be improved. Using a post injection in a triple-injection case show to have less effect on the combustion phasing than pilot injection in a double-injection case, while it can significantly affect combustion efficiency. The later of the double-injection cases tested (c30/16), has less heat transfer losses since the high-temperature region transported away from the cylinder head and piston bowl wall, which can be seen in the CFD-simulations. The highest gross indicated efficiency among the tested cases is given by the triple-injection case d38/24/6 as it reaches the best balance between the mixing and the local temperature through the jet-jet interactions and combustion-jet interactions.

AB - Partially premixed combustion (PPC) is a promising way to achieve high thermal efficiency and low emissions, especially by using multiple injection strategies. The mechanisms behind PPC efficiency are still to be explained and explored. In this paper, multiple injections have been used to affect the gross indicated efficiency in an optical PPC engine modified from a Volvo MD13 heavy-duty diesel engine. The aim is both to improve and impair the gross indicated efficiency to understand the differences. The combustion natural luminosity is captured by a high-speed camera, and the distribution of fuel, oxygen, and temperature during the combustion process has been further explored by CFD simulation. The results show that with the right combination of the pilot, main, and post injection the gross indicated efficiency can be improved. Using a post injection in a triple-injection case show to have less effect on the combustion phasing than pilot injection in a double-injection case, while it can significantly affect combustion efficiency. The later of the double-injection cases tested (c30/16), has less heat transfer losses since the high-temperature region transported away from the cylinder head and piston bowl wall, which can be seen in the CFD-simulations. The highest gross indicated efficiency among the tested cases is given by the triple-injection case d38/24/6 as it reaches the best balance between the mixing and the local temperature through the jet-jet interactions and combustion-jet interactions.

U2 - 10.4271/2020-01-1131

DO - 10.4271/2020-01-1131

M3 - Paper in conference proceeding

T3 - SAE Technical Papers

BT - WCX SAE World Congress Experience

PB - Society of Automotive Engineers

ER -